Re: "Recursive parsing"

[Carl Cerecke]

Xinan Tang wrote:
> Hi
>
>  
>
>   In O’reilly book “ Lex & yacc “ written by John R. Levine etc., it 
> discussed a way to support recursive parsing, i.e. during parsing 
> grammar A yyparse() is called again to parse grammar B. This is very 
> typical in parsing a HTML file, in which some script program may be 
> embedded in the same HTML file. However the way that is suggested is to 
> manually rename some C variables and make them local to yyparse() (page 
> 209 -210 in the book).
>
>  
>
>   Has anyone tried to support recursive parsing in bison, especially 
> writing a grammer for HTML and its script languages?

It's quite simple in bison (if I remember correctly).

The yy prefix for all the important variables/functions etc. can be
changed with the appropriate option. So one parser could be yyparse(),
and the other could be zzparse().

Cheers,
Carl.